applying online is exactly like throwing resumes at a shredder. this is a long, hard, process. if you want to be a CRA, and you know what a CRA does, then you should know most want experience. There are exceptions with on the job training. The most proactive and effective way would be to find an ad, call HR, tell them you just submitted a resume and you were wondering about the job, marketing yourself and your ability to learn fast, and asking them if you can learn on the job.
again, very few people take entry level CRAs. you would have to start out as a clinical research coordinator most likely.
lag year jobs = dead end jobs. tricky system.
monster and career builder are slow. dont give up on them. most people that are graduating get jobs through networking (number is around 70% for those who ACTUALLY get jobs - that doesn't mean 70% get immediately employeed). From the rest, craigslist is still their best resource for finding immediate placement. Some academic centers do post ads frequently on craigslist, esp Harvard/MGH/Partners, etc.
Good luck